/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.query.reader.series;

import org.apache.iotdb.commons.exception.MetadataException;
import org.apache.iotdb.db.constant.TestConstant;
import org.apache.iotdb.db.engine.cache.ChunkCache;
import org.apache.iotdb.db.engine.cache.TimeSeriesMetadataCache;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.engine.storagegroup.TsFileResourceStatus;
import org.apache.iotdb.db.query.control.FileReaderManager;
import org.apache.iotdb.db.utils.EnvironmentUtils;
import org.apache.iotdb.tsfile.exception.write.WriteProcessException;
import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.write.TsFileWriter;
import org.apache.iotdb.tsfile.write.record.TSRecord;
import org.apache.iotdb.tsfile.write.record.datapoint.DataPoint;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.junit.Assert;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.apache.iotdb.commons.conf.IoTDBConstant.PATH_SEPARATOR;

/**
 * This util contains 5 seqFiles and 5 unseqFiles in default.
 *
 * <p>Sequence time range of data: [0, 99], [100, 199], [200, 299], [300, 399], [400, 499]
 *
 * <p>UnSequence time range of data: [0, 19], [100, 139], [200, 259], [300, 379], [400, 499], [0,
 * 199]
 */
public class SeriesReaderTestUtil {

    private static int seqFileNum = 5;
    private static int unseqFileNum = 5;
    private static int measurementNum = 10;
    private static int deviceNum = 10;
    private static long ptNum = 100;
    private static long flushInterval = 20;
    private static TSEncoding encoding = TSEncoding.PLAIN;

    public static void setUp(
            List<MeasurementSchema> measurementSchemas,
            List<String> deviceIds,
            List<TsFileResource> seqResources,
            List<TsFileResource> unseqResources,
            String sgName)
            throws MetadataException, IOException, WriteProcessException {
        prepareSeries(measurementSchemas, deviceIds, sgName);
        prepareFiles(seqResources, unseqResources, measurementSchemas, deviceIds, sgName);
    }

    public static void tearDown(
            List<TsFileResource> seqResources, List<TsFileResource> unseqResources) throws IOException {
        removeFiles(seqResources, unseqResources);
        seqResources.clear();
        unseqResources.clear();
        ChunkCache.getInstance().clear();
        TimeSeriesMetadataCache.getInstance().clear();
        EnvironmentUtils.cleanAllDir();
    }

    private static void prepareFiles(
            List<TsFileResource> seqResources,
            List<TsFileResource> unseqResources,
            List<MeasurementSchema> measurementSchemas,
            List<String> deviceIds,
            String sgName)
            throws IOException, WriteProcessException {
        for (int i = 0; i < seqFileNum; i++) {
            File file = new File(TestConstant.getTestTsFilePath(sgName, 0, 0, i));
            TsFileResource tsFileResource = new TsFileResource(file);
            tsFileResource.setStatus(TsFileResourceStatus.CLOSED);
            tsFileResource.setMinPlanIndex(i);
            tsFileResource.setMaxPlanIndex(i);
            tsFileResource.setVersion(i);
            seqResources.add(tsFileResource);
            prepareFile(tsFileResource, i * ptNum, ptNum, 0, measurementSchemas, deviceIds);
        }
        for (int i = 0; i < unseqFileNum; i++) {
            File file = new File(TestConstant.getTestTsFilePath(sgName, 0, 0, i + seqFileNum));
            TsFileResource tsFileResource = new TsFileResource(file);
            tsFileResource.setStatus(TsFileResourceStatus.CLOSED);
            tsFileResource.setMinPlanIndex(i + seqFileNum);
            tsFileResource.setMaxPlanIndex(i + seqFileNum);
            tsFileResource.setVersion(i + seqFileNum);
            unseqResources.add(tsFileResource);
            prepareFile(
                    tsFileResource,
                    i * ptNum,
                    ptNum * (i + 1) / unseqFileNum,
                    10000,
                    measurementSchemas,
                    deviceIds);
        }

        File file = new File(TestConstant.getTestTsFilePath(sgName, 0, 0, seqFileNum + unseqFileNum));
        TsFileResource tsFileResource = new TsFileResource(file);
        tsFileResource.setStatus(TsFileResourceStatus.CLOSED);
        tsFileResource.setMinPlanIndex(seqFileNum + unseqFileNum);
        tsFileResource.setMaxPlanIndex(seqFileNum + unseqFileNum);
        tsFileResource.setVersion(seqFileNum + unseqFileNum);
        unseqResources.add(tsFileResource);
        prepareFile(tsFileResource, 0, ptNum * 2, 20000, measurementSchemas, deviceIds);
    }

    private static void prepareFile(
            TsFileResource tsFileResource,
            long timeOffset,
            long ptNum,
            long valueOffset,
            List<MeasurementSchema> measurementSchemas,
            List<String> deviceIds)
            throws IOException, WriteProcessException {
        File file = tsFileResource.getTsFile();
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        TsFileWriter fileWriter = new TsFileWriter(file);
        Map<String, MeasurementSchema> template = new HashMap<>();
        for (MeasurementSchema measurementSchema : measurementSchemas) {
            template.put(measurementSchema.getMeasurementId(), measurementSchema);
        }
        fileWriter.registerSchemaTemplate("template0", template, false);
        for (String deviceId : deviceIds) {
            fileWriter.registerDevice(deviceId, "template0");
        }
        for (long i = timeOffset; i < timeOffset + ptNum; i++) {
            for (String deviceId : deviceIds) {
                TSRecord record = new TSRecord(i, deviceId);
                for (MeasurementSchema measurementSchema : measurementSchemas) {
                    record.addTuple(
                            DataPoint.getDataPoint(
                                    measurementSchema.getType(),
                                    measurementSchema.getMeasurementId(),
                                    String.valueOf(i + valueOffset)));
                }
                fileWriter.write(record);
                tsFileResource.updateStartTime(deviceId, i);
                tsFileResource.updateEndTime(deviceId, i);
            }
            if ((i + 1) % flushInterval == 0) {
                fileWriter.flushAllChunkGroups();
            }
        }
        fileWriter.close();
    }

    private static void prepareSeries(
            List<MeasurementSchema> measurementSchemas, List<String> deviceIds, String sgName) {
        for (int i = 0; i < measurementNum; i++) {
            measurementSchemas.add(
                    new MeasurementSchema(
                            "sensor" + i, TSDataType.INT32, encoding, CompressionType.UNCOMPRESSED));
        }
        for (int i = 0; i < deviceNum; i++) {
            deviceIds.add(sgName + PATH_SEPARATOR + "device" + i);
        }
    }

    private static void removeFiles(
            List<TsFileResource> seqResources, List<TsFileResource> unseqResources) throws IOException {
        for (TsFileResource tsFileResource : seqResources) {
            tsFileResource.remove();
        }
        for (TsFileResource tsFileResource : unseqResources) {
            tsFileResource.remove();
        }

        FileReaderManager.getInstance().closeAndRemoveAllOpenedReaders();
    }
}
